(gdb) bt
#0  0x040007f2 in ?? () from /lib/ld-linux.so.2
#1  0x041890c0 in pthread_cond_signal@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0410ec96 in pthread_cond_signal () from /lib/tls/i686/cmov/libc.so.6
#3  0x080b4d3c in __ast_cond_signal (filename=0x819e39b "devicestate.c", lineno=456, func=0x819e76c "__ast_devstate_changed_literal", cond_name=0x819e7e4 "&change_pending", cond=0x81e4ba0)
    at /home/vopella/downloads/asterisk-1.6.0-beta9/include/asterisk/lock.h:519
#4  0x080b4a5f in __ast_devstate_changed_literal (state=AST_DEVICE_UNKNOWN, buf=0x55740d0 "SIP/sv0071ivr-04410470", norecurse=0) at devicestate.c:456
#5  0x080b4e7a in ast_device_state_changed_literal (dev=0x5574184 "SIP/sv0071ivr-04410470") at devicestate.c:490
#6  0x080960a1 in ast_channel_free (chan=0x4415dd8) at channel.c:1335
#7  0x08096ff6 in ast_hangup (chan=0x4415dd8) at channel.c:1639
#8  0x054d9658 in hanguptree (outgoing=0x440fd70, exception=0x0, answered_elsewhere=0) at app_dial.c:347
#9  0x054e2976 in dial_exec_full (chan=0x440d040, data=0x55770d8, peerflags=0x5574ddc, continue_exec=0x0) at app_dial.c:1937
#10 0x054e32fe in dial_exec (chan=0x440d040, data=0x55770d8) at app_dial.c:1958
#11 0x08100498 in pbx_exec (c=0x440d040, app=0x43f3ba0, data=0x55770d8) at pbx.c:745
#12 0x0810784a in pbx_extension_helper (c=0x440d040, con=0x0, context=0x440d284 "from-iax", exten=0x440d2d4 "6136274820", priority=1, label=0x0, callerid=0x440d950 "6137959112", action=E_SPAWN,
    found=0x5579228, combined_find_spawn=1) at pbx.c:2904
#13 0x081094e1 in ast_spawn_extension (c=0x440d040, context=0x440d284 "from-iax", exten=0x440d2d4 "6136274820", priority=1, callerid=0x440d950 "6137959112", found=0x5579228, combined_find_spawn=1)
    at pbx.c:3395
#14 0x08109d88 in __ast_pbx_run (c=0x440d040) at pbx.c:3494
#15 0x0810b2a3 in pbx_thread (data=0x440d040) at pbx.c:3760
#16 0x0815ca4d in dummy_start (data=0x440e0e0) at utils.c:872
#17 0x041844fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#18 0x04101e5e in clone () from /lib/tls/i686/cmov/libc.so.6